Chuck and faceplate for grinding machines



April 13, 1948.

F. KIDD ET 'AL CHUCK AND FACE-PLA' I'E FOR GRINDING MACHINES Filed Sept. 28, 1945 I RAID H 770? ry.

Patented Apr. 13,; 1948 CHUCK AND FACEPLATE FOR GRINDING MACHINES Frederick Kidd and Thomas Dargue Kidd, Stockton-on-Tees, England Application September 28, 1945, Serial No. 619,082

. In Great Britain June 30, 1944 f Section 1, Public Law,690, August s, 1946 Patent expires June 30, 1964 This invention relates to chucks and face-plates for grinding machines, and has particular reference to chucks wherein a face grinding wheel is held by a split taperedring which is provided with a lining of fibrous material and is compressed to clamp the grinding wheel by a flanged collar on an external screwed part of the chuck. Such chucks are usually provided internally with an adjustable disc or back plate to give support to the grinding wheel.

The object of the present invention is to provide an improved construction of chuck which will permit the grinding wheel to be revolved with safety at a i her speed than has hitherto been practicable.

According to this invention, we positively lock the face grinding wheel against axial movement in relation to the chuck. For this purpose, we provide the external periphery of the wheel and the split tapered ring with inter-engaging portions, said portions comprising, for example, an internal lip on the ring capable of being engaged with any one of a number of circumferential grooves around the wheel... Suitably-pitched spaced projections may be substituted for said lip and a spiral groove provided around the wheel. The adjustable disc or back plate of the chuck may be dispensed with.

We will more fully describe our invention with reference to the accompanying drawing, wherein Fig. 1 is a side elevation, half in section, of one construction of chuck embodying our invention;

Fig. 2 is a similar View to Fig. 1 of a slightly modified construction; and

Figs. 3 and 4 are a front elevation and a sectional elevation respectively of a face-plate fitted with a number of chucks according to Fig 2.

Referring first to Fig. 1 of the drawing, in the example therein illustrated, the chuck body a is provided with an internal boss b screwed externally at c to receive the internally-screwed boss d of a back plate or adjusting disc e. The chuck body is also provided with a flange 1 having an internal coned surface g, said flange being screwed externally to receive a collar h having a flange 7' and a locking ring it for said collar. A split tapered ring m is inserted into the coned flange j of the chuck body, said ring having an internal parallel surface lined with suitable fibrous material which is indicated at n. The flbrous material lies between the split ring 112 and the cylindrical face grinding wheel which is shown at p and is inserted in the chuck body so that its rear face q bears against the adjustable back 4 Claims. (01. 51--2o9) vided with an internallip r, the projecting end of the ring being engaged by the flange :i of the collar h. By screwing up the collar h with the rear face q of the grinding wheel clear of the back plate e, the split ring m is compressed by the coaction of its tapered periphery with the coned internal surface g of the flange fof the chuck body and thereby caused to clamp the grinding wheel 1) in the body of the chuck. Externally the grinding wheel is provided with a number of parallel circumferential grooves .9 any one of which can be engaged by the lip r of the tapered ring, the inter-engagement of these portions positively holding the wheel against axial movement in relation to the chuck and permitting it to be revolved with safety at a, higher speed than. has hitherto been practicable. The grooves s are spaced to allow adjustment of the wheel when it wears down, the back plate e being correspondingly adjusted on the screwed boss b of the chuck body to provide support for the inner end of the wheel.

In the modified construction illustrated in Fig. 2, one continuous and spirally arranged groove s is disposed around the grinding wheel p. A series of angularly spaced projections r are substituted on the split tapered ring m for the lip r of Fig. l, the said projections r being suitably pitched to co-act with the spiral groove 8'. The screwed boss I) of the chuck body a is omitted and the back plate e is dispensed with, it being found in practice that the co-action of the projections r of the split tapered ring 111, with the groove 3' around the cylindrical face grinding wheel p provides sufllcient support for said wheel. In other respects, the construction of Fig. 2 is substantially the same as that of Fig. l, and the parts thereof have been correspondingly lettered. In the case of a chuck constructed as shown in Fig. 2, the cylindrical face grinding wheel may either be an annulus p as shown or it may be solid.

,As will be readily understood the spiral groove on the grinding wheel and the co-acting spaced projections on the split tapered ring of the form of device shown in Fig. 2, may be substituted in the form of device shown in Fig. 1 for the parallel grooves and co-acting lip. and vice-versa.

A single chuck constructed as shown either in Fig. l or in Fig, 2 may be mounted on a drivin spindle, and, as the grindingwheel p or p in the chuck is lockedagainst axialmovement, it can be used with its axis horizontal or vertical as may be desired.

Our improved chucks are also applicable to face-plates. This arrangement is illustrated in Figs. 3 and 4 which show a face-plate 23 having twelve chucks a constructed according to Fig. 2 equidistantly mounted in a circle around its face, each chuck holding a grinding wheeLp .This arrangement provides the equivalent of a segmental grinding wheel. The body of each chuck is received in a circular recess u in the face-plate t and is secured therein by a bolt.v,,the headsof the bolts engaging the bodies of thechucks a around central bolt holes w (Fig. 2).

Dowels may be driven through holes m in the face-plate i into holes y (Fig. 2) in the chuck bodies a positively to 'secllre the latter against rotationon the face-plate t. -z-is-the:nutsecuring the face-plateto the driving spindle What we claim and-desire to secure byLetters Patent is: r

l. A grinding device comprisinga chuck having a casing externallyscrew threaded-and internally tapered, a split externallytapered ring disposed within said casing, 'a face grinding wheel disposed within said split tapered ring, a lining of fibrous material interposed-between saidring and said'wheeLa screw-threaded nut on said casing provided with aninternal flange for-abutting one end of the said tapered ring .whereby When the nut is screwedonto the casing-the tapered ring-is moved along the internal tapered portion of, the

casing and compressed, the said tapered ring being provided internally with'inwardlydirected projecting means and the said face grinding wheel being recessed on its outer periphery to'bc positively engaged by said inwardly projecting means on the said .tapered ring whereby axial movement of the wheel inthe chuck'is restrained.

2. A grinding device comprising a chuck body having a centrally disposed exteriorly threaded 4 boss and a peripheral exteriorly threaded and interiorly tapered flange, an adjusting disk threaded on said boss, an exteriorly taperedsplit ring qdisposedwithin saidflange a grinding wheel disposed within said splitring, said split ring and wheel having cooperating means for retaining the wheel with one end in abutting contact with said adjusting disk, and a collar in threaded engagement with 'said flange, said collar having means for engaging the split ring at the outer end thereof thereby tourge the ring into wedging engagement with theinner surface of the flange and lock the grinding wheel against axial movement between said ring and said adjusting disk. I;

.3. A' grinding device as set forth in claim 2 wherein theexternal periphery of the wheel is 7 provided with a number of longitudinally spaced circumferential grooves and the split tapered ring is'provided with an internal lip capable of being engaged with any one of said grooves.

'4. .A grinding device asset .forth in claim 2 wherein the external peripher -of the iwheelr is provided with a spiral groove-a hespl t ap red ring is provided with suitably pitched-spaced projections.

FREDERICKJKIDD. THOMAS DARGUE KIDD.

REFERENCES CITED The following references are of record 'insthe file of this patent: 1

UNITED STATES PATENTS France 'Sept. 17,1921 

